Carbureter.



w. H. PARK.

CARBUHETER.

APPLICATION FILED SEPT. 8, 1913.

Patented Jan. 11, 19H3.

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APPLICATION FILED SEPT. s, I9I3.

M. Patented m. II, 1916.

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WILLIAM R. PARK, OF TAUNTON, MASSACHUSETTS, ASSIGNOR TO UNITED INJECTORCOMPANY, 0F NEW YORK, N. Y.; A CORPORATION'OF NEW YORK.

CARBURETER.

Specification of Letters Patent.

Patented Jan. Jil, 1916.

Application led September 8, 1913. Serial No. 788,500.

To al?, whom t may concern:

Be it known that I, WILLIAM R. PARK, a citizen of the United States, andresident ot Taunton, in the county ot Bristol and State ofliz'lassach'usetts, have invented new and useful Improvements inCarbureters, of which the following is a specification.

My invention relates to carbureters for supplying combustible mixturesto internal combustion engines, and `consists in improvements whichwhile generally applicable are particularly adapted to acarbureter ofthe character shown and described in United States Letters Patent No.955,353, issued to me April 19, 1910. One of the chief characteristicsofthe carbureter de scribedl in the aforesaid patent is a' gravity airvalve controlling the air duct which supplies the mixing tube of thecarbureter. This air valve as arranged in the carbur'eter shown in thesaid patent is necessarily quite heavy, and consequently possessesconsider able Ainertia and is therefore not quite as sensitive as mightbe desired.

I have found by investigation and demonstration that in a carbureter inwhich the supply of liquid fuel is graduated in some direct proportionto the supply of air it is desirable so to proportion the passagesleading to the engine that a decidedly high vacuum shall be produced inthe mixing tube, say one corresponding to 30 inches of water column.lVith such a manometric value in the mixing tube it is obvious that avalve arranged as shown in my said patent will necessarily be quiteheavy, and for this reason lack that sensitiveness which is desirpart ofthe casing.

able.

In the drawings hereto annexed which illustrate my improvements,-Figure1 is a vertical section ofa carbureter; Fig. 9. is a plan view, partlybroken away; Fig. 3 is a vertical section on the line 3-3 of Fig. 2; andFig. et. is a plan view of a detail, namely, the adjusting yoke whichforms part of the connections between the air valve and the fuel supplyvalve.

In thesedrawings, the carbureter casing is composed of several parts, A,A', A2, the float chamber A3 being formed in the lower The mixing tube Bwhich is preferably' in the form of a constricted passage, comprises adepending portion B" which lower part A of the casing. The fuelsupand abinding screw extends down into therises through the annuler ductbetween the central air tube D and the surrounding tube N. The latter ismounted on the centra-l boss E at the periphery of which is formed thevalve seat E, the latter coperating with the air valve V. This air valveV is a gravity valve, and is provided with a seat ing edge at V whichseats on the periphery E ofthe boss E. The diameter of this valve seatis less than the external diameter of the depending portion V of themixing tube B, and the valve V is mounted to slide upon the exterior ofthis portion B of the mixing tube. Additional bearing may, if desired,be had, as at V2 on the central tube N. The valve V is grooved, as atV3, this groove cooperating with the stem F which forms part of theconnection between the air valve- C and the needle valve I formed by thelower end of the stem 1. This connection comprises also the yoke G whichis split at G and threaded to receive the threaded end F of the rod F.

At I2 the stem Ivis secured to the yoke G, H serves to lock the yoke Gand rod F irmly together.

A squared keyhole F2 is formed in the top of rod F so that by means of asuitable key, adjustment of the connection between the air valve V andfuel valve I may be made. These connections are housed in the portion A2of the carbureter casing, this latter being supplied with a suitablecover A4.

Since the diameter of the lower portion B of the mixing tube B isgreater than that of the seat V of the valve V, this valve is adiil'erential valve; therefore it may be made of light weight andconsequently possess little inertia, and at the same time besufficiently heavy to control the air inlet properly under conditions oflow pressure in the mixing tube B. i

It is essential that the valve V shall at all times slide smoothly onits bearings, and although the double bearing at Vand V2 is almostcertain to suffice for this purpose, I have found it advisabley to applya steadyingiinger to the side ot' the valve V. Such a finger is shown inFig. 3 at K, this being secured to t-he carbureter casing at K andprovided with a soft pad,as of felt, at L, which bears with a lighttouch against the valve V. This steadying finger being opposite to theconnectionwith the fuel valve serves eti'ectually to check any tendencyof sticking or chattering of the valve.

I claim:

l. In a carbureter, the combination of a tubular gravity air valve, aseat therefor coacting with the lower end of the tubular valve, a mixingtube entering the upper end of the tubular air valve and constituting asliding bearing for the valve, the diameter of the upper end of thetubular bore of the air valve being greater than that of the lower end,a fuel inlet communicating with the interior of the mixing tube, and aneedle valve to control the fuel supply, connected with and operatedbythe gravity air valve.

2. In a carbureter, the combination of a tubular gravity air valve, aseat therefor coacting with the lower end of the tubular valve, a mixingtube entering the upper end of the tubular air valve and constituting asliding bearing for the valve, the diameter of the upper end of thetubular bore of the air valve being greater than that of the lower end,a steadying finger bearing on the gravity air valve, and a fuel inletcommunicating with the interior of the mixing tube.

3. In a carbureter, the combination of a tubular gravity air valve, aseat therefor coacting with the lower end of the tubular valve, a mixingtube entering the upper end of the tubular air valve and constituting asliding bearing for the valve, the diameter of the upper end of thetubular bore-of the air valve being greater than that of the lower end,a'fuel inlet communicating with the interior of the mixing tube, aneedle valve to control the fuel supply, connected with and operated bythe gravity air valve, and a steadying finger bearing on the gravity airvalve.

Signed by me at Boston, Massachusetts, this lth day of September 1913.

WILLIAM R. PARK. Witnesses:

CHARLES D. WOODBERRY, ODIN ROBERTS.

